tree c521349d7730ec47b60fe78a63822123c0fcf87d
parent 053ab70f0604224c7893b43f9d9d5efa283580d6
author Liu Bo <bo.li.liu@oracle.com> 1471990978 -0700
committer Chris Mason <clm@fb.com> 1472122711 -0700

Btrfs: detect corruption when non-root leaf has zero item

Right now we treat leaf which has zero item as a valid one
because we could have an empty tree, that is, a root that is
also a leaf without any item, however, in the same case but
when the leaf is not a root, we can end up with hitting the
BUG_ON(1) in btrfs_extend_item() called by
setup_inline_extent_backref().

This makes us check the situation as a corruption if leaf is
not its own root.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>